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How to Drill a Peephole in a Door with a Power Drill – A Step-by-Step Guide

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Written By John Gibbs




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Having a peephole in your door is a great way to enhance your home security and to check who is at your door without having to open it. But how do you go about drilling a peephole in a door? This article will provide a step-by-step guide on how to drill a peephole in a door. You’ll learn how to measure and mark the area, how to choose the right drill bit and how to install the peephole safely and securely. Let’s get started on how to drill a peephole in a door.

What You’ll Need

What You'Ll Need


A drill is essential for creating a peephole in a door. It should have adjustable speed settings and an appropriate size for the job.

Drill Bit

The drill bit should be chosen based on the type of door you have. A wood door requires a wood drill bit, while a metal door needs a masonry bit.

Tape Measure

A tape measure is necessary to accurately measure the size of the peephole you will need. It should be at least two inches in diameter.


A pencil is necessary to mark the spot where the peephole will be drilled. Once the spot is marked, make sure to double check the measurements before drilling.

Now that you have the supplies, you are ready to begin the process of how to drill a peephole in a metal door.

Before Drilling

Before Drilling

Safety First: Before drilling, make sure to put on safety glasses and gloves. This will help protect your eyes and skin from debris and dust that can occur while drilling.

Measuring: To ensure a proper fit, measure the diameter of the peephole you are installing. The most common size is 1-1/8 inch, but sizes may differ depending on the peephole.

Drill Bit: Use a drill bit that is the same size as the peephole you are installing. A 1-1/8 inch drill bit is ideal for a 1-1/8 inch peephole, so make sure you know what size drill bit for peephole you need before you start drilling.

Selecting the Right Location: When selecting a location for the peephole, make sure it is at a height that is comfortable for you when standing. It should also be at a location that is not directly exposed to sunlight or moisture, as this can cause damage to the peephole over time.

Marking the Location: Use a pencil to mark the location where you will be drilling the peephole. This will help you keep the hole in the right place. If you are unsure of the exact location, mark several spots and then choose the one that works best.

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How to Drill a Peephole in a Metal Door

How To Drill A Peephole In A Metal Door
Mark the Location
To begin, you will need to decide where you would like to drill the hole. Use a ruler or measuring tape to mark the spot on the outside of the door where you want the peephole to be. You will want to make sure that the hole is located at eye level and is slightly off-center in the door.

Measure the Distance
Now that you have marked the spot, it is time to measure the distance. Use a ruler or measuring tape to measure the distance between the edge of the door and the spot you marked. This will help you determine what type of drill bit you will need for the job.

Select the Appropriate Drill Bit
In order to drill a peephole in a metal door, you will need a special drill bit. The drill bit should be one size smaller than the measurement you took in the previous step. If you are unsure of what type of bit to use, consult a local hardware store for assistance.

Drill the Hole
Once you have chosen the appropriate drill bit, it is time to drill the hole. Make sure the drill bit is securely attached to the drill before beginning. Place the drill bit at the spot you marked and begin drilling. Be careful not to press too hard, as the drill bit may slip and cause damage to the door. Once the hole is drilled, you are ready to install the peephole.

Now that you know how to drill a peephole in a metal door, you can easily add a layer of security to your home. The same steps can also be used to drill a peephole in a wooden door.

How to Drill a Peephole in a Wooden Door

How To Drill A Peephole In A Wooden Door
Mark the Location

Using a ruler or tape measure, determine the center of the door’s thickness. Mark this spot with a pencil.

Measure the Distance

Measure the height of the peephole to be installed, and mark it on the door at the previously determined center spot.

Select the Appropriate Drill Bit

Choose a drill bit that is slightly smaller than the width of the peephole.

Drill the Hole

Drill a hole at the marked spot, taking care to drill slowly and evenly. If the drill bit is too large, the hole may not be secure.

Secure the Peephole

Insert the peephole into the hole, and secure it in place with the included screws or adhesive.


Once your peephole is installed, it is important to take proper care of it to ensure it lasts as long as possible. Make sure to clean the lens at least once a month using a soft cloth and warm, soapy water. To help reduce wear, use a light coat of oil on the hinge of the door to help the door open and close smoothly. Additionally, use a light lubricant on the peephole cylinder to ensure easy turning. Replace any loose screws or hardware with new ones to ensure the peephole is secure. Lastly, inspect the peephole to make sure it is still securely attached to the door.

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Frequently Asked Questions

What tools do I need to drill a peephole in a door?

  • Power Drill: Get a power drill with the right specification for your door’s material. The size of the drill bit should be between 10-15mm.
  • Hole Saw Bit: Choose a hole saw bit that has the same size as the power drill bit you have. You can also use a spade bit if you have a metal door.
  • Drill Press: This is an optional tool, but it makes the job easier and more accurate.
  • Measuring Tape: Measure the door and the peephole location to make sure you are drilling in the right spot.
  • Safety Glasses: Wear safety glasses to protect your eyes from any debris when drilling.
  • Goggles: Wear goggles if you are drilling a metal door to protect your eyes from metal chips.

How can I measure the correct spot to drill?

To ensure your peephole is centered on the door, measure the height of the door and divide it in half. Mark the midpoint with a pencil. Then measure the width of the door and divide it in half. Mark the midpoint with a pencil. The two points should be at the same level and will be the center of the peephole. Use a level to ensure the points are at the same height.

What should I do if the drill bit gets stuck in the door?

  • Stop Drilling: Immediately stop drilling when you feel the drill bit getting stuck. Do not force the drill bit further as you may end up damaging the door.
  • Check the Bit: Carefully inspect the drill bit to see if any debris or material is blocking it. Remove any debris, then try drilling again.
  • Tap the Bit: Gently tap the drill bit with a hammer on the sides to loosen it up, then try drilling again.
  • Use a Lubricant: If tapping the bit doesn’t work, try applying some lubricant such as WD-40 or a penetrating oil. Allow the lubricant to penetrate for a few minutes, then try drilling again.
  • Remove the Bit: If all else fails, you may need to remove the drill bit from the door. Unplug the drill and use a pair of pliers to carefully remove the bit from the door.

How do I protect the door from damage while drilling?

Drilling a peephole in a door can cause damage if done incorrectly. To ensure the door remains undamaged, follow these steps:

  • Mark the area with a pencil: Place a piece of tape over the area where the peephole will be drilled. Trace the outline of the peephole onto the tape with a pencil. This will give you a precise target area for drilling.
  • Use a drill bit with a stop collar: A stop collar will prevent the drill bit from going too deep and damaging the door. Find a bit that is slightly smaller than the size of the peephole and attach the stop collar to it.
  • Drill slowly and evenly: When drilling, hold the drill bit at an angle and press down lightly. Drill slowly and evenly, so that the bit doesn’t slip or jam.
  • Stop drilling when you reach the stop collar: The stop collar will prevent the drill bit from going any further into the door, protecting it from damage. When you reach the collar, stop drilling and remove the bit.

By following these steps, you can ensure that the door remains undamaged while drilling a peephole.

Are There Any Special Techniques for Drilling a Peephole in a Metal Door?

Drilling a peephole in a metal door requires special techniques because metal is harder than wood and can dull the drill bit quickly. To avoid this, use a high-speed drill bit specifically designed for metal, such as a titanium- or cobalt-coated bit. Start your drill at a lower speed and gradually increase it as the bit begins to penetrate the metal. To reduce friction and heat, use a lubricant such as oil or a cooling spray. It is important to keep the drill bit cool to avoid damaging the metal. Additionally, use light pressure when drilling to avoid damaging the metal door. Finally, use a template to mark the spot for drilling and use a center punch to make a small dent, preventing the drill bit from slipping.


Drilling a peephole in a door is a straightforward job that doesn’t require much experience. As long as you have the right tools, follow the steps outlined and take the necessary safety precautions, you should have no problems drilling your peephole.



About John Gibbs

Hello everyone! My name is John Gibbs. I am 60 years old and have been in the family construction business all my adult life. Construction is not only my profession but also my passion. I know everything about building and repair materials, tools, advanced methods, techniques, and approaches. I will share the same knowledge with you in my articles.

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